Not Ranked
For learning tool on dimensions and perspectives, try google sketchup..a really neat novice program more design oriented that manufacturing. If you want something better, try Alibre free..awesome program for CAD/CAM. I use it to run my Mid Mill CNC. Another solid program (purchase) is TurboCad. Comes in one pack with 2d and 3d with tutorials and a lot of tools. Was about $40, don't know now.
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"I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious." Thomas Jefferson
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